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Write a value of int1/(1+e^x)\ dx...

Write a value of `int1/(1+e^x)\ dx`

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Solution:
`\int \frac{1}{e^{x}+1} d x`
=`\int \frac{e^{-x}}{e^{-x}\(e^{x}+1\right)} d x`
=`\int \frac{e^{-x}}{1+e^{-x}} d x`
Let `\t=\e^(-\x)+1 \Rightarrow d \t=-\e^-\x \dx`
=`\int \frac{-\{dt}}{\{t}}`
...
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